Method and apparatus for evaluating partial derivatives
US4817027A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1987 |
| Grant date | Mar 28, 1989 |
| Priority date | — |
| Expiry date | Mar 23, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F17/13
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a novel method and apparatus for the automatic evaluation of partial derivatives. A computer memory system is organized and controlled so that partial derivatives are evaluated, without approximation, for any given function at specified values of the independent variables of the function. The method involves parsing the given function and assigning codes, including priority order, to each function element. The function elements are then examined individually along with their priority codes by an interpreter which determines when an operation should be performed. To perform operations which result in the evaluation of partial derivatives, there is provided an evaluation matrix to organize and store values, and an evaluator which is used to manipulate the evaluation matrix for operations specified by the interpreter. The evaluator performs manipulations on the evaluation matrix by using a number of sets of instructions which are derived from the rules defining partial derivatives. The parser, interpreter, evaluator and organized memory system work together to provide an efficient means, operable on a simple digital computer, for performing an accurate a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.